Trail of Blood

 is a side quest in Tyranny, unlocked after completing Opportune Offensive given by Splinter at Cacophony.

Synopsis
Track down the Oath Bound that have been targeting Scarlet Furies in the Vendrien's Well region.

Walkthrough

 * Go to Matani River.
 * Murder everyone present.
 * Return to Sanguinari to receive a recipe for Fatiguing toxin.